Klaxon Posted March 5, 2016 Share Posted March 5, 2016 (edited) So we just started a unit on motion. The question is: Calculate the mass of an object if it accelerated at 3.5m/s squared under the influence of a net force of 70N. Is the way to work this out just m= w/g? I got 20kg. Edited March 5, 2016 by Klaxon Link to comment Share on other sites More sharing options...
studiot Posted March 5, 2016 Share Posted March 5, 2016 The net force causing the acceleration is Force = mass x acceleration. In the dynamics of motion we regard gravity as an acceleration (g), not a force, so Weight is the name we give to the force that gravity exterts on a body of mass m. W = mg In this system, remember that kg are units of mass, not force or weight. Force is in Newtons. (you have to convert if it is given in any other units) So W is in Newtons, mass is in kg and acceleration is in metres per second2 Does this help? Link to comment Share on other sites More sharing options...
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